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  <h1>Source code for pylorax.imgutils</h1><div class="highlight"><pre>
<span></span><span class="c1"># imgutils.py - utility functions/classes for building disk images</span>
<span class="c1">#</span>
<span class="c1"># Copyright (C) 2011-2018 Red Hat, Inc.</span>
<span class="c1">#</span>
<span class="c1"># This program is free software; you can redistribute it and/or modify</span>
<span class="c1"># it under the terms of the GNU General Public License as published by</span>
<span class="c1"># the Free Software Foundation; either version 2 of the License, or</span>
<span class="c1"># (at your option) any later version.</span>
<span class="c1">#</span>
<span class="c1"># This program is distributed in the hope that it will be useful,</span>
<span class="c1"># but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="c1"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class="c1"># GNU General Public License for more details.</span>
<span class="c1">#</span>
<span class="c1"># You should have received a copy of the GNU General Public License</span>
<span class="c1"># along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<span class="c1">#</span>
<span class="c1"># Author(s):  Will Woods &lt;wwoods@redhat.com&gt;</span>

<span class="kn">import</span> <span class="nn">logging</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">&quot;pylorax.imgutils&quot;</span><span class="p">)</span>

<span class="kn">import</span> <span class="nn">os</span><span class="o">,</span> <span class="nn">tempfile</span>
<span class="kn">from</span> <span class="nn">os.path</span> <span class="kn">import</span> <span class="n">join</span><span class="p">,</span> <span class="n">dirname</span>
<span class="kn">from</span> <span class="nn">subprocess</span> <span class="kn">import</span> <span class="n">Popen</span><span class="p">,</span> <span class="n">PIPE</span><span class="p">,</span> <span class="n">CalledProcessError</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="kn">import</span> <span class="nn">traceback</span>
<span class="kn">import</span> <span class="nn">multiprocessing</span>
<span class="kn">from</span> <span class="nn">time</span> <span class="kn">import</span> <span class="n">sleep</span>
<span class="kn">import</span> <span class="nn">shutil</span>

<span class="kn">from</span> <span class="nn">pylorax.sysutils</span> <span class="kn">import</span> <span class="n">cpfile</span>
<span class="kn">from</span> <span class="nn">pylorax.executils</span> <span class="kn">import</span> <span class="n">execWithRedirect</span><span class="p">,</span> <span class="n">execWithCapture</span>
<span class="kn">from</span> <span class="nn">pylorax.executils</span> <span class="kn">import</span> <span class="n">runcmd</span><span class="p">,</span> <span class="n">runcmd_output</span>

<span class="c1">######## Functions for making container images (cpio, tar, squashfs) ##########</span>

<div class="viewcode-block" id="compress"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.compress">[docs]</a><span class="k">def</span> <span class="nf">compress</span><span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">root</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">compression</span><span class="o">=</span><span class="s2">&quot;xz&quot;</span><span class="p">,</span> <span class="n">compressargs</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Make a compressed archive of the given rootdir or file.</span>
<span class="sd">    command is a list of the archiver commands to run</span>
<span class="sd">    compression should be &quot;xz&quot;, &quot;gzip&quot;, &quot;lzma&quot;, &quot;bzip2&quot;, or None.</span>
<span class="sd">    compressargs will be used on the compression commandline.&#39;&#39;&#39;</span>
    <span class="k">if</span> <span class="n">compression</span> <span class="ow">not</span> <span class="ow">in</span> <span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="s2">&quot;xz&quot;</span><span class="p">,</span> <span class="s2">&quot;gzip&quot;</span><span class="p">,</span> <span class="s2">&quot;lzma&quot;</span><span class="p">,</span> <span class="s2">&quot;bzip2&quot;</span><span class="p">):</span>
        <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">&quot;Unknown compression type </span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="n">compression</span><span class="p">)</span>
    <span class="n">compressargs</span> <span class="o">=</span> <span class="n">compressargs</span> <span class="ow">or</span> <span class="p">[</span><span class="s2">&quot;-9&quot;</span><span class="p">]</span>
    <span class="k">if</span> <span class="n">compression</span> <span class="o">==</span> <span class="s2">&quot;xz&quot;</span><span class="p">:</span>
        <span class="n">compressargs</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="s2">&quot;--check=crc32&quot;</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">compression</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">compression</span> <span class="o">=</span> <span class="s2">&quot;cat&quot;</span> <span class="c1"># this is a little silly</span>
        <span class="n">compressargs</span> <span class="o">=</span> <span class="p">[]</span>

    <span class="c1"># make compression run with multiple threads if possible</span>
    <span class="k">if</span> <span class="n">compression</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">&quot;xz&quot;</span><span class="p">,</span> <span class="s2">&quot;lzma&quot;</span><span class="p">):</span>
        <span class="n">compressargs</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="s2">&quot;-T</span><span class="si">%d</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">cpu_count</span><span class="p">())</span>
    <span class="k">elif</span> <span class="n">compression</span> <span class="o">==</span> <span class="s2">&quot;gzip&quot;</span><span class="p">:</span>
        <span class="n">compression</span> <span class="o">=</span> <span class="s2">&quot;pigz&quot;</span>
        <span class="n">compressargs</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="s2">&quot;-p</span><span class="si">%d</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">cpu_count</span><span class="p">())</span>
    <span class="k">elif</span> <span class="n">compression</span> <span class="o">==</span> <span class="s2">&quot;bzip2&quot;</span><span class="p">:</span>
        <span class="n">compression</span> <span class="o">=</span> <span class="s2">&quot;pbzip2&quot;</span>
        <span class="n">compressargs</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="s2">&quot;-p</span><span class="si">%d</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">cpu_count</span><span class="p">())</span>

    <span class="n">find</span><span class="p">,</span> <span class="n">archive</span><span class="p">,</span> <span class="n">comp</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="kc">None</span><span class="p">,</span> <span class="kc">None</span>

    <span class="k">try</span><span class="p">:</span>
        <span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">root</span><span class="p">):</span>
            <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;find </span><span class="si">%s</span><span class="s2"> -print0 |</span><span class="si">%s</span><span class="s2"> | </span><span class="si">%s</span><span class="s2"> </span><span class="si">%s</span><span class="s2"> &gt; </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">root</span><span class="p">,</span> <span class="s2">&quot; &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">command</span><span class="p">),</span>
                    <span class="n">compression</span><span class="p">,</span> <span class="s2">&quot; &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">compressargs</span><span class="p">),</span> <span class="n">outfile</span><span class="p">)</span>

            <span class="n">find</span> <span class="o">=</span> <span class="n">Popen</span><span class="p">([</span><span class="s2">&quot;find&quot;</span><span class="p">,</span> <span class="s2">&quot;.&quot;</span><span class="p">,</span> <span class="s2">&quot;-print0&quot;</span><span class="p">],</span> <span class="n">stdout</span><span class="o">=</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">cwd</span><span class="o">=</span><span class="n">root</span><span class="p">)</span>
            <span class="n">archive</span> <span class="o">=</span> <span class="n">Popen</span><span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">find</span><span class="o">.</span><span class="n">stdout</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">cwd</span><span class="o">=</span><span class="n">root</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;echo </span><span class="si">%s</span><span class="s2"> |</span><span class="si">%s</span><span class="s2"> | </span><span class="si">%s</span><span class="s2"> </span><span class="si">%s</span><span class="s2"> &gt; </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">root</span><span class="p">,</span> <span class="s2">&quot; &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">command</span><span class="p">),</span>
                         <span class="n">compression</span><span class="p">,</span> <span class="s2">&quot; &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">compressargs</span><span class="p">),</span> <span class="n">outfile</span><span class="p">)</span>

            <span class="n">archive</span> <span class="o">=</span> <span class="n">Popen</span><span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">cwd</span><span class="o">=</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">root</span><span class="p">))</span>
            <span class="n">archive</span><span class="o">.</span><span class="n">stdin</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">basename</span><span class="p">(</span><span class="n">root</span><span class="p">)</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span> <span class="o">+</span> <span class="sa">b</span><span class="s2">&quot;</span><span class="se">\0</span><span class="s2">&quot;</span><span class="p">)</span>
            <span class="n">archive</span><span class="o">.</span><span class="n">stdin</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>

        <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="s2">&quot;wb&quot;</span><span class="p">)</span> <span class="k">as</span> <span class="n">fout</span><span class="p">:</span>
            <span class="n">comp</span> <span class="o">=</span> <span class="n">Popen</span><span class="p">([</span><span class="n">compression</span><span class="p">]</span> <span class="o">+</span> <span class="n">compressargs</span><span class="p">,</span>
                         <span class="n">stdin</span><span class="o">=</span><span class="n">archive</span><span class="o">.</span><span class="n">stdout</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="n">fout</span><span class="p">)</span>
            <span class="n">comp</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span>

        <span class="c1"># Clean up the open fds and processes</span>
        <span class="k">if</span> <span class="n">find</span><span class="p">:</span>
            <span class="n">find</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span>
            <span class="n">find</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
        <span class="n">archive</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span>
        <span class="k">if</span> <span class="n">archive</span><span class="o">.</span><span class="n">stdin</span><span class="p">:</span>
            <span class="n">archive</span><span class="o">.</span><span class="n">stdin</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
        <span class="k">if</span> <span class="n">archive</span><span class="o">.</span><span class="n">stdout</span><span class="p">:</span>
            <span class="n">archive</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
        <span class="k">return</span> <span class="n">comp</span><span class="o">.</span><span class="n">returncode</span>
    <span class="k">except</span> <span class="ne">OSError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
        <span class="c1"># Kill off any hanging processes</span>
        <span class="nb">list</span><span class="p">(</span><span class="n">p</span><span class="o">.</span><span class="n">kill</span><span class="p">()</span> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="p">(</span><span class="n">find</span><span class="p">,</span> <span class="n">archive</span><span class="p">,</span> <span class="n">comp</span><span class="p">)</span> <span class="k">if</span> <span class="n">p</span><span class="p">)</span>
        <span class="k">return</span> <span class="mi">1</span></div>

<div class="viewcode-block" id="mkcpio"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkcpio">[docs]</a><span class="k">def</span> <span class="nf">mkcpio</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">compression</span><span class="o">=</span><span class="s2">&quot;xz&quot;</span><span class="p">,</span> <span class="n">compressargs</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="n">compressargs</span> <span class="o">=</span> <span class="n">compressargs</span> <span class="ow">or</span> <span class="p">[</span><span class="s2">&quot;-9&quot;</span><span class="p">]</span>
    <span class="k">return</span> <span class="n">compress</span><span class="p">([</span><span class="s2">&quot;cpio&quot;</span><span class="p">,</span> <span class="s2">&quot;--null&quot;</span><span class="p">,</span> <span class="s2">&quot;--quiet&quot;</span><span class="p">,</span> <span class="s2">&quot;-H&quot;</span><span class="p">,</span> <span class="s2">&quot;newc&quot;</span><span class="p">,</span> <span class="s2">&quot;-o&quot;</span><span class="p">],</span>
                    <span class="n">root</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">compression</span><span class="p">,</span> <span class="n">compressargs</span><span class="p">)</span></div>

<div class="viewcode-block" id="mktar"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mktar">[docs]</a><span class="k">def</span> <span class="nf">mktar</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">compression</span><span class="o">=</span><span class="s2">&quot;xz&quot;</span><span class="p">,</span> <span class="n">compressargs</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">selinux</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
    <span class="n">compressargs</span> <span class="o">=</span> <span class="n">compressargs</span> <span class="ow">or</span> <span class="p">[</span><span class="s2">&quot;-9&quot;</span><span class="p">]</span>
    <span class="n">tar_cmd</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;tar&quot;</span><span class="p">,</span> <span class="s2">&quot;--no-recursion&quot;</span><span class="p">]</span>
    <span class="k">if</span> <span class="n">selinux</span><span class="p">:</span>
        <span class="n">tar_cmd</span> <span class="o">+=</span> <span class="p">[</span><span class="s2">&quot;--selinux&quot;</span><span class="p">,</span> <span class="s2">&quot;--acls&quot;</span><span class="p">,</span> <span class="s2">&quot;--xattrs&quot;</span><span class="p">]</span>
    <span class="n">tar_cmd</span> <span class="o">+=</span> <span class="p">[</span><span class="s2">&quot;-cf-&quot;</span><span class="p">,</span> <span class="s2">&quot;--null&quot;</span><span class="p">,</span> <span class="s2">&quot;-T-&quot;</span><span class="p">]</span>
    <span class="k">return</span> <span class="n">compress</span><span class="p">(</span><span class="n">tar_cmd</span><span class="p">,</span> <span class="n">root</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">compression</span><span class="p">,</span> <span class="n">compressargs</span><span class="p">)</span></div>

<div class="viewcode-block" id="mksquashfs"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mksquashfs">[docs]</a><span class="k">def</span> <span class="nf">mksquashfs</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">compression</span><span class="o">=</span><span class="s2">&quot;default&quot;</span><span class="p">,</span> <span class="n">compressargs</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Make a squashfs image containing the given rootdir.&#39;&#39;&#39;</span>
    <span class="n">compressargs</span> <span class="o">=</span> <span class="n">compressargs</span> <span class="ow">or</span> <span class="p">[]</span>
    <span class="k">if</span> <span class="n">compression</span> <span class="o">!=</span> <span class="s2">&quot;default&quot;</span><span class="p">:</span>
        <span class="n">compressargs</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;-comp&quot;</span><span class="p">,</span> <span class="n">compression</span><span class="p">]</span> <span class="o">+</span> <span class="n">compressargs</span>
    <span class="k">return</span> <span class="n">execWithRedirect</span><span class="p">(</span><span class="s2">&quot;mksquashfs&quot;</span><span class="p">,</span> <span class="p">[</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">]</span> <span class="o">+</span> <span class="n">compressargs</span><span class="p">)</span></div>

<div class="viewcode-block" id="mkrootfsimg"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkrootfsimg">[docs]</a><span class="k">def</span> <span class="nf">mkrootfsimg</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">label</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">sysroot</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Make rootfs image from a directory</span>

<span class="sd">    :param str rootdir: Root directory</span>
<span class="sd">    :param str outfile: Path of output image file</span>
<span class="sd">    :param str label: Filesystem label</span>
<span class="sd">    :param int size: Size of the image in GiB, if None computed automatically</span>
<span class="sd">    :param str sysroot: path to system (deployment) root relative to physical root</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">if</span> <span class="n">size</span><span class="p">:</span>
        <span class="n">fssize</span> <span class="o">=</span> <span class="n">size</span> <span class="o">*</span> <span class="p">(</span><span class="mi">1024</span><span class="o">*</span><span class="mi">1024</span><span class="o">*</span><span class="mi">1024</span><span class="p">)</span> <span class="c1"># 2GB sparse file compresses down to nothin&#39;</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="n">fssize</span> <span class="o">=</span> <span class="kc">None</span>       <span class="c1"># Let mkext4img figure out the needed size</span>

    <span class="n">mkext4img</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="n">label</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="n">fssize</span><span class="p">)</span></div>


<span class="c1">######## Utility functions ###############################################</span>

<div class="viewcode-block" id="mksparse"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mksparse">[docs]</a><span class="k">def</span> <span class="nf">mksparse</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;use os.ftruncate to create a sparse file of the given size.&#39;&#39;&#39;</span>
    <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="s2">&quot;w&quot;</span><span class="p">)</span> <span class="k">as</span> <span class="n">fobj</span><span class="p">:</span>
        <span class="n">os</span><span class="o">.</span><span class="n">ftruncate</span><span class="p">(</span><span class="n">fobj</span><span class="o">.</span><span class="n">fileno</span><span class="p">(),</span> <span class="nb">int</span><span class="p">(</span><span class="n">size</span><span class="p">))</span></div>

<div class="viewcode-block" id="mkqcow2"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkqcow2">[docs]</a><span class="k">def</span> <span class="nf">mkqcow2</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">options</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;use qemu-img to create a file of the given size.</span>
<span class="sd">       options is a list of options passed to qemu-img</span>

<span class="sd">       Default format is qcow2, override by passing &quot;-f&quot;, fmt</span>
<span class="sd">       in options.</span>
<span class="sd">    &#39;&#39;&#39;</span>
    <span class="n">mkqemu_img</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">options</span><span class="p">)</span></div>

<div class="viewcode-block" id="mkqemu_img"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkqemu_img">[docs]</a><span class="k">def</span> <span class="nf">mkqemu_img</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">options</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;use qemu-img to create a file of the given size.</span>
<span class="sd">       options is a list of options passed to qemu-img</span>

<span class="sd">       Default format is qcow2, override by passing &quot;-f&quot;, fmt</span>
<span class="sd">       in options.</span>
<span class="sd">    &#39;&#39;&#39;</span>
    <span class="n">options</span> <span class="o">=</span> <span class="n">options</span> <span class="ow">or</span> <span class="p">[]</span>
    <span class="k">if</span> <span class="s2">&quot;-f&quot;</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">options</span><span class="p">:</span>
        <span class="n">options</span><span class="o">.</span><span class="n">extend</span><span class="p">([</span><span class="s2">&quot;-f&quot;</span><span class="p">,</span> <span class="s2">&quot;qcow2&quot;</span><span class="p">])</span>
    <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;qemu-img&quot;</span><span class="p">,</span> <span class="s2">&quot;create&quot;</span><span class="p">]</span> <span class="o">+</span> <span class="n">options</span> <span class="o">+</span> <span class="p">[</span><span class="n">outfile</span><span class="p">,</span> <span class="nb">str</span><span class="p">(</span><span class="n">size</span><span class="p">)])</span></div>

<div class="viewcode-block" id="loop_waitfor"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.loop_waitfor">[docs]</a><span class="k">def</span> <span class="nf">loop_waitfor</span><span class="p">(</span><span class="n">loop_dev</span><span class="p">,</span> <span class="n">outfile</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Make sure the loop device is attached to the outfile.</span>

<span class="sd">    It seems that on rare occasions losetup can return before the /dev/loopX is</span>
<span class="sd">    ready for use, causing problems with mkfs. This tries to make sure that the</span>
<span class="sd">    loop device really is associated with the backing file before continuing.</span>

<span class="sd">    Raise RuntimeError if it isn&#39;t setup after 5 tries.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">for</span> <span class="n">_x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">5</span><span class="p">):</span>
        <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;udevadm&quot;</span><span class="p">,</span> <span class="s2">&quot;settle&quot;</span><span class="p">,</span> <span class="s2">&quot;--timeout&quot;</span><span class="p">,</span> <span class="s2">&quot;300&quot;</span><span class="p">])</span>
        <span class="c1">## XXX Note that losetup --list output can be truncated to 64 bytes in some</span>
        <span class="c1">##     situations. Don&#39;t use it to lookup backing file, go the other way</span>
        <span class="c1">##     and lookup the loop for the backing file. See util-linux lib/loopdev.c</span>
        <span class="c1">##     loopcxt_get_backing_file()</span>
        <span class="k">if</span> <span class="n">get_loop_name</span><span class="p">(</span><span class="n">outfile</span><span class="p">)</span> <span class="o">==</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">basename</span><span class="p">(</span><span class="n">loop_dev</span><span class="p">):</span>
            <span class="k">return</span>

        <span class="c1"># If this really is a race, give it some time to settle down</span>
        <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>

    <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s2">&quot;Unable to setup </span><span class="si">%s</span><span class="s2"> on </span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">loop_dev</span><span class="p">,</span> <span class="n">outfile</span><span class="p">))</span></div>

<div class="viewcode-block" id="loop_attach"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.loop_attach">[docs]</a><span class="k">def</span> <span class="nf">loop_attach</span><span class="p">(</span><span class="n">outfile</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Attach a loop device to the given file. Return the loop device name.</span>

<span class="sd">    On rare occasions it appears that the device never shows up, some experiments</span>
<span class="sd">    seem to indicate that it may be a race with another process using /dev/loop* devices.</span>

<span class="sd">    So we now try 3 times before actually failing.</span>

<span class="sd">    Raises CalledProcessError if losetup fails.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">retries</span> <span class="o">=</span> <span class="mi">0</span>
    <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">retries</span> <span class="o">+=</span> <span class="mi">1</span>
            <span class="n">dev</span> <span class="o">=</span> <span class="n">runcmd_output</span><span class="p">([</span><span class="s2">&quot;losetup&quot;</span><span class="p">,</span> <span class="s2">&quot;--find&quot;</span><span class="p">,</span> <span class="s2">&quot;--show&quot;</span><span class="p">,</span> <span class="n">outfile</span><span class="p">])</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span>

            <span class="c1"># Sometimes the loop device isn&#39;t ready yet, make extra sure before returning</span>
            <span class="n">loop_waitfor</span><span class="p">(</span><span class="n">dev</span><span class="p">,</span> <span class="n">outfile</span><span class="p">)</span>
        <span class="k">except</span> <span class="ne">RuntimeError</span><span class="p">:</span>
            <span class="c1"># Try to setup the loop device 3 times</span>
            <span class="k">if</span> <span class="n">retries</span> <span class="o">==</span> <span class="mi">3</span><span class="p">:</span>
                <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;loop_attach failed, retries exhausted.&quot;</span><span class="p">)</span>
                <span class="k">raise</span>
            <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;Try </span><span class="si">%d</span><span class="s2"> failed, </span><span class="si">%s</span><span class="s2"> did not appear.&quot;</span><span class="p">,</span> <span class="n">retries</span><span class="p">,</span> <span class="n">dev</span><span class="p">)</span>
        <span class="k">break</span>
    <span class="k">return</span> <span class="n">dev</span></div>

<div class="viewcode-block" id="loop_detach"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.loop_detach">[docs]</a><span class="k">def</span> <span class="nf">loop_detach</span><span class="p">(</span><span class="n">loopdev</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Detach the given loop device. Return False on failure.&#39;&#39;&#39;</span>
    <span class="k">return</span> <span class="p">(</span><span class="n">execWithRedirect</span><span class="p">(</span><span class="s2">&quot;losetup&quot;</span><span class="p">,</span> <span class="p">[</span><span class="s2">&quot;--detach&quot;</span><span class="p">,</span> <span class="n">loopdev</span><span class="p">])</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span></div>

<div class="viewcode-block" id="get_loop_name"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.get_loop_name">[docs]</a><span class="k">def</span> <span class="nf">get_loop_name</span><span class="p">(</span><span class="n">path</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Return the loop device associated with the path.</span>
<span class="sd">    Raises RuntimeError if more than one loop is associated&#39;&#39;&#39;</span>
    <span class="n">buf</span> <span class="o">=</span> <span class="n">runcmd_output</span><span class="p">([</span><span class="s2">&quot;losetup&quot;</span><span class="p">,</span> <span class="s2">&quot;-j&quot;</span><span class="p">,</span> <span class="n">path</span><span class="p">])</span>
    <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">buf</span><span class="o">.</span><span class="n">splitlines</span><span class="p">())</span> <span class="o">&gt;</span> <span class="mi">1</span><span class="p">:</span>
        <span class="c1"># there should never be more than one loop device listed</span>
        <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s2">&quot;multiple loops associated with </span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="n">path</span><span class="p">)</span>
    <span class="n">name</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">basename</span><span class="p">(</span><span class="n">buf</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">&quot;:&quot;</span><span class="p">)[</span><span class="mi">0</span><span class="p">])</span>
    <span class="k">return</span> <span class="n">name</span></div>

<div class="viewcode-block" id="dm_attach"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.dm_attach">[docs]</a><span class="k">def</span> <span class="nf">dm_attach</span><span class="p">(</span><span class="n">dev</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Attach a devicemapper device to the given device, with the given size.</span>
<span class="sd">    If name is None, a random name will be chosen. Returns the device name.</span>
<span class="sd">    raises CalledProcessError if dmsetup fails.&#39;&#39;&#39;</span>
    <span class="k">if</span> <span class="n">name</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">name</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">mktemp</span><span class="p">(</span><span class="n">prefix</span><span class="o">=</span><span class="s2">&quot;lorax.imgutils.&quot;</span><span class="p">,</span> <span class="nb">dir</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">)</span>
    <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;dmsetup&quot;</span><span class="p">,</span> <span class="s2">&quot;create&quot;</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="s2">&quot;--table&quot;</span><span class="p">,</span>
                       <span class="s2">&quot;0 </span><span class="si">%i</span><span class="s2"> linear </span><span class="si">%s</span><span class="s2"> 0&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">size</span><span class="o">/</span><span class="mi">512</span><span class="p">,</span> <span class="n">dev</span><span class="p">)])</span>
    <span class="k">return</span> <span class="n">name</span></div>

<div class="viewcode-block" id="dm_detach"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.dm_detach">[docs]</a><span class="k">def</span> <span class="nf">dm_detach</span><span class="p">(</span><span class="n">dev</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Detach the named devicemapper device. Returns False if dmsetup fails.&#39;&#39;&#39;</span>
    <span class="n">dev</span> <span class="o">=</span> <span class="n">dev</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s2">&quot;/dev/mapper/&quot;</span><span class="p">,</span> <span class="s2">&quot;&quot;</span><span class="p">)</span> <span class="c1"># strip prefix, if it&#39;s there</span>
    <span class="k">return</span> <span class="n">execWithRedirect</span><span class="p">(</span><span class="s2">&quot;dmsetup&quot;</span><span class="p">,</span> <span class="p">[</span><span class="s2">&quot;remove&quot;</span><span class="p">,</span> <span class="n">dev</span><span class="p">])</span></div>

<div class="viewcode-block" id="mount"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mount">[docs]</a><span class="k">def</span> <span class="nf">mount</span><span class="p">(</span><span class="n">dev</span><span class="p">,</span> <span class="n">opts</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">mnt</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Mount the given device at the given mountpoint, using the given opts.</span>
<span class="sd">    opts should be a comma-separated string of mount options.</span>
<span class="sd">    if mnt is none, a temporary directory will be created and its path will be</span>
<span class="sd">    returned.</span>
<span class="sd">    raises CalledProcessError if mount fails.&#39;&#39;&#39;</span>
    <span class="k">if</span> <span class="n">mnt</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">mnt</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">mkdtemp</span><span class="p">(</span><span class="n">prefix</span><span class="o">=</span><span class="s2">&quot;lorax.imgutils.&quot;</span><span class="p">)</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;make tmp mountdir </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">mnt</span><span class="p">)</span>
    <span class="n">cmd</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;mount&quot;</span><span class="p">]</span>
    <span class="k">if</span> <span class="n">opts</span><span class="p">:</span>
        <span class="n">cmd</span> <span class="o">+=</span> <span class="p">[</span><span class="s2">&quot;-o&quot;</span><span class="p">,</span> <span class="n">opts</span><span class="p">]</span>
    <span class="n">cmd</span> <span class="o">+=</span> <span class="p">[</span><span class="n">dev</span><span class="p">,</span> <span class="n">mnt</span><span class="p">]</span>
    <span class="n">runcmd</span><span class="p">(</span><span class="n">cmd</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">mnt</span></div>

<div class="viewcode-block" id="umount"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.umount">[docs]</a><span class="k">def</span> <span class="nf">umount</span><span class="p">(</span><span class="n">mnt</span><span class="p">,</span>  <span class="n">lazy</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">maxretry</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">retrysleep</span><span class="o">=</span><span class="mf">1.0</span><span class="p">,</span> <span class="n">delete</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Unmount the given mountpoint. If lazy is True, do a lazy umount (-l).</span>
<span class="sd">    If the mount was a temporary dir created by mount, it will be deleted.</span>
<span class="sd">    raises CalledProcessError if umount fails.&#39;&#39;&#39;</span>
    <span class="n">cmd</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;umount&quot;</span><span class="p">]</span>
    <span class="k">if</span> <span class="n">lazy</span><span class="p">:</span> <span class="n">cmd</span> <span class="o">+=</span> <span class="p">[</span><span class="s2">&quot;-l&quot;</span><span class="p">]</span>
    <span class="n">cmd</span> <span class="o">+=</span> <span class="p">[</span><span class="n">mnt</span><span class="p">]</span>
    <span class="n">count</span> <span class="o">=</span> <span class="mi">0</span>
    <span class="k">while</span> <span class="n">maxretry</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">rv</span> <span class="o">=</span> <span class="n">runcmd</span><span class="p">(</span><span class="n">cmd</span><span class="p">)</span>
        <span class="k">except</span> <span class="n">CalledProcessError</span><span class="p">:</span>
            <span class="n">count</span> <span class="o">+=</span> <span class="mi">1</span>
            <span class="k">if</span> <span class="n">count</span> <span class="o">==</span> <span class="n">maxretry</span><span class="p">:</span>
                <span class="k">raise</span>
            <span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">&quot;failed to unmount </span><span class="si">%s</span><span class="s2">. retrying (</span><span class="si">%d</span><span class="s2">/</span><span class="si">%d</span><span class="s2">)...&quot;</span><span class="p">,</span>
                           <span class="n">mnt</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">maxretry</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">logger</span><span class="o">.</span><span class="n">getEffectiveLevel</span><span class="p">()</span> <span class="o">&lt;=</span> <span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">:</span>
                <span class="n">fuser</span> <span class="o">=</span> <span class="n">execWithCapture</span><span class="p">(</span><span class="s2">&quot;fuser&quot;</span><span class="p">,</span> <span class="p">[</span><span class="s2">&quot;-vm&quot;</span><span class="p">,</span> <span class="n">mnt</span><span class="p">])</span>
                <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;fuser -vm:</span><span class="se">\n</span><span class="si">%s</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">fuser</span><span class="p">)</span>
            <span class="n">sleep</span><span class="p">(</span><span class="n">retrysleep</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="k">break</span>
    <span class="k">if</span> <span class="n">delete</span> <span class="ow">and</span> <span class="s1">&#39;lorax.imgutils&#39;</span> <span class="ow">in</span> <span class="n">mnt</span><span class="p">:</span>
        <span class="n">os</span><span class="o">.</span><span class="n">rmdir</span><span class="p">(</span><span class="n">mnt</span><span class="p">)</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;remove tmp mountdir </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">mnt</span><span class="p">)</span>
    <span class="k">return</span> <span class="p">(</span><span class="n">rv</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span></div>

<div class="viewcode-block" id="copytree"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.copytree">[docs]</a><span class="k">def</span> <span class="nf">copytree</span><span class="p">(</span><span class="n">src</span><span class="p">,</span> <span class="n">dest</span><span class="p">,</span> <span class="n">preserve</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Copy a tree of files using cp -a, thus preserving modes, timestamps,</span>
<span class="sd">    links, acls, sparse files, xattrs, selinux contexts, etc.</span>
<span class="sd">    If preserve is False, uses cp -R (useful for modeless filesystems)</span>
<span class="sd">    raises CalledProcessError if copy fails.&#39;&#39;&#39;</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;copytree </span><span class="si">%s</span><span class="s2"> </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">src</span><span class="p">,</span> <span class="n">dest</span><span class="p">)</span>
    <span class="n">cp</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;cp&quot;</span><span class="p">,</span> <span class="s2">&quot;-a&quot;</span><span class="p">]</span> <span class="k">if</span> <span class="n">preserve</span> <span class="k">else</span> <span class="p">[</span><span class="s2">&quot;cp&quot;</span><span class="p">,</span> <span class="s2">&quot;-R&quot;</span><span class="p">,</span> <span class="s2">&quot;-L&quot;</span><span class="p">,</span> <span class="s2">&quot;--preserve=timestamps&quot;</span><span class="p">]</span>
    <span class="n">cp</span> <span class="o">+=</span> <span class="p">[</span><span class="n">join</span><span class="p">(</span><span class="n">src</span><span class="p">,</span> <span class="s2">&quot;.&quot;</span><span class="p">),</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">abspath</span><span class="p">(</span><span class="n">dest</span><span class="p">)]</span>
    <span class="n">runcmd</span><span class="p">(</span><span class="n">cp</span><span class="p">)</span></div>

<div class="viewcode-block" id="do_grafts"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.do_grafts">[docs]</a><span class="k">def</span> <span class="nf">do_grafts</span><span class="p">(</span><span class="n">grafts</span><span class="p">,</span> <span class="n">dest</span><span class="p">,</span> <span class="n">preserve</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Copy each of the items listed in grafts into dest.</span>
<span class="sd">    If the key ends with &#39;/&#39; it&#39;s assumed to be a directory which should be</span>
<span class="sd">    created, otherwise just the leading directories will be created.&#39;&#39;&#39;</span>
    <span class="k">for</span> <span class="n">imgpath</span><span class="p">,</span> <span class="n">filename</span> <span class="ow">in</span> <span class="n">grafts</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
        <span class="k">if</span> <span class="n">imgpath</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">==</span> <span class="s1">&#39;/&#39;</span><span class="p">:</span>
            <span class="n">targetdir</span> <span class="o">=</span> <span class="n">join</span><span class="p">(</span><span class="n">dest</span><span class="p">,</span> <span class="n">imgpath</span><span class="p">)</span>
            <span class="n">imgpath</span> <span class="o">=</span> <span class="n">imgpath</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">targetdir</span> <span class="o">=</span> <span class="n">join</span><span class="p">(</span><span class="n">dest</span><span class="p">,</span> <span class="n">dirname</span><span class="p">(</span><span class="n">imgpath</span><span class="p">))</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">targetdir</span><span class="p">):</span>
            <span class="n">os</span><span class="o">.</span><span class="n">makedirs</span><span class="p">(</span><span class="n">targetdir</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span>
            <span class="n">copytree</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="n">join</span><span class="p">(</span><span class="n">dest</span><span class="p">,</span> <span class="n">imgpath</span><span class="p">),</span> <span class="n">preserve</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">cpfile</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="n">join</span><span class="p">(</span><span class="n">dest</span><span class="p">,</span> <span class="n">imgpath</span><span class="p">))</span></div>

<div class="viewcode-block" id="round_to_blocks"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.round_to_blocks">[docs]</a><span class="k">def</span> <span class="nf">round_to_blocks</span><span class="p">(</span><span class="n">size</span><span class="p">,</span> <span class="n">blocksize</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;If size isn&#39;t a multiple of blocksize, round up to the next multiple&#39;&#39;&#39;</span>
    <span class="n">diff</span> <span class="o">=</span> <span class="n">size</span> <span class="o">%</span> <span class="n">blocksize</span>
    <span class="k">if</span> <span class="n">diff</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">size</span><span class="p">:</span>
        <span class="n">size</span> <span class="o">+=</span> <span class="n">blocksize</span> <span class="o">-</span> <span class="n">diff</span>
    <span class="k">return</span> <span class="n">size</span></div>

<span class="c1"># TODO: move filesystem data outside this function</span>
<div class="viewcode-block" id="estimate_size"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.estimate_size">[docs]</a><span class="k">def</span> <span class="nf">estimate_size</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">graft</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">fstype</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">blocksize</span><span class="o">=</span><span class="mi">4096</span><span class="p">,</span> <span class="n">overhead</span><span class="o">=</span><span class="mi">256</span><span class="p">):</span>
    <span class="n">graft</span> <span class="o">=</span> <span class="n">graft</span> <span class="ow">or</span> <span class="p">{}</span>
    <span class="n">getsize</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">f</span><span class="p">:</span> <span class="n">os</span><span class="o">.</span><span class="n">lstat</span><span class="p">(</span><span class="n">f</span><span class="p">)</span><span class="o">.</span><span class="n">st_size</span>
    <span class="k">if</span> <span class="n">fstype</span> <span class="o">==</span> <span class="s2">&quot;btrfs&quot;</span><span class="p">:</span>
        <span class="n">overhead</span> <span class="o">=</span> <span class="mi">64</span><span class="o">*</span><span class="mi">1024</span> <span class="c1"># don&#39;t worry, it&#39;s all sparse</span>
    <span class="k">if</span> <span class="n">fstype</span> <span class="o">==</span> <span class="s2">&quot;hfsplus&quot;</span><span class="p">:</span>
        <span class="n">overhead</span> <span class="o">=</span> <span class="mi">200</span> <span class="c1"># hack to deal with two bootloader copies</span>
    <span class="k">if</span> <span class="n">fstype</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">&quot;vfat&quot;</span><span class="p">,</span> <span class="s2">&quot;msdos&quot;</span><span class="p">):</span>
        <span class="n">blocksize</span> <span class="o">=</span> <span class="mi">2048</span>
        <span class="n">getsize</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">f</span><span class="p">:</span> <span class="n">os</span><span class="o">.</span><span class="n">stat</span><span class="p">(</span><span class="n">f</span><span class="p">)</span><span class="o">.</span><span class="n">st_size</span> <span class="c1"># no symlinks, count as copies</span>
    <span class="n">total</span> <span class="o">=</span> <span class="n">overhead</span><span class="o">*</span><span class="n">blocksize</span>
    <span class="n">dirlist</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">graft</span><span class="o">.</span><span class="n">values</span><span class="p">())</span>
    <span class="k">if</span> <span class="n">rootdir</span><span class="p">:</span>
        <span class="n">dirlist</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">rootdir</span><span class="p">)</span>
    <span class="k">for</span> <span class="n">root</span> <span class="ow">in</span> <span class="n">dirlist</span><span class="p">:</span>
        <span class="k">for</span> <span class="n">top</span><span class="p">,</span> <span class="n">dirs</span><span class="p">,</span> <span class="n">files</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">root</span><span class="p">):</span>
            <span class="k">for</span> <span class="n">f</span> <span class="ow">in</span> <span class="n">files</span> <span class="o">+</span> <span class="n">dirs</span><span class="p">:</span>
                <span class="n">total</span> <span class="o">+=</span> <span class="n">round_to_blocks</span><span class="p">(</span><span class="n">getsize</span><span class="p">(</span><span class="n">join</span><span class="p">(</span><span class="n">top</span><span class="p">,</span><span class="n">f</span><span class="p">)),</span> <span class="n">blocksize</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">fstype</span> <span class="o">==</span> <span class="s2">&quot;btrfs&quot;</span><span class="p">:</span>
        <span class="n">total</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="mi">256</span><span class="o">*</span><span class="mi">1024</span><span class="o">*</span><span class="mi">1024</span><span class="p">,</span> <span class="n">total</span><span class="p">)</span> <span class="c1"># btrfs minimum size: 256MB</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Size of </span><span class="si">%s</span><span class="s2"> block </span><span class="si">%s</span><span class="s2"> fs at </span><span class="si">%s</span><span class="s2"> estimated to be </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">blocksize</span><span class="p">,</span> <span class="n">fstype</span><span class="p">,</span> <span class="n">rootdir</span><span class="p">,</span> <span class="n">total</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">total</span></div>

<span class="c1">######## Execution contexts - use with the &#39;with&#39; statement ##############</span>

<div class="viewcode-block" id="LoopDev"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.LoopDev">[docs]</a><span class="k">class</span> <span class="nc">LoopDev</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">filename</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">loopdev</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">filename</span> <span class="o">=</span> <span class="n">filename</span>
        <span class="k">if</span> <span class="n">size</span><span class="p">:</span>
            <span class="n">mksparse</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">filename</span><span class="p">,</span> <span class="n">size</span><span class="p">)</span>
    <span class="k">def</span> <span class="fm">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">loopdev</span> <span class="o">=</span> <span class="n">loop_attach</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">filename</span><span class="p">)</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">loopdev</span>
    <span class="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">tracebk</span><span class="p">):</span>
        <span class="n">loop_detach</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">loopdev</span><span class="p">)</span></div>

<div class="viewcode-block" id="DMDev"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.DMDev">[docs]</a><span class="k">class</span> <span class="nc">DMDev</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dev</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mapperdev</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dev</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">size</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span> <span class="o">=</span> <span class="p">(</span><span class="n">dev</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
    <span class="k">def</span> <span class="fm">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mapperdev</span> <span class="o">=</span> <span class="n">dm_attach</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dev</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">size</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">mapperdev</span>
    <span class="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">tracebk</span><span class="p">):</span>
        <span class="n">dm_detach</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mapperdev</span><span class="p">)</span></div>

<div class="viewcode-block" id="Mount"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.Mount">[docs]</a><span class="k">class</span> <span class="nc">Mount</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dev</span><span class="p">,</span> <span class="n">opts</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">mnt</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dev</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">opts</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">mnt</span><span class="p">)</span> <span class="o">=</span> <span class="p">(</span><span class="n">dev</span><span class="p">,</span> <span class="n">opts</span><span class="p">,</span> <span class="n">mnt</span><span class="p">)</span>
    <span class="k">def</span> <span class="fm">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mnt</span> <span class="o">=</span> <span class="n">mount</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dev</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">opts</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">mnt</span><span class="p">)</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">mnt</span>
    <span class="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">tracebk</span><span class="p">):</span>
        <span class="n">umount</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mnt</span><span class="p">)</span></div>

<div class="viewcode-block" id="kpartx_disk_img"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.kpartx_disk_img">[docs]</a><span class="k">def</span> <span class="nf">kpartx_disk_img</span><span class="p">(</span><span class="n">disk_img</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Attach a disk image&#39;s partitions to /dev/loopX using kpartx</span>

<span class="sd">    :param disk_img: The full path to a partitioned disk image</span>
<span class="sd">    :type disk_img: str</span>
<span class="sd">    :returns: list of (loopXpN, size)</span>
<span class="sd">    :rtype: list of tuples</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="c1"># Example kpartx output</span>
    <span class="c1"># kpartx -p p -v -a /tmp/diskV2DiCW.im</span>
    <span class="c1"># add map loop2p1 (253:2): 0 3481600 linear /dev/loop2 2048</span>
    <span class="c1"># add map loop2p2 (253:3): 0 614400 linear /dev/loop2 3483648</span>
    <span class="n">kpartx_output</span> <span class="o">=</span> <span class="n">runcmd_output</span><span class="p">([</span><span class="s2">&quot;kpartx&quot;</span><span class="p">,</span> <span class="s2">&quot;-v&quot;</span><span class="p">,</span> <span class="s2">&quot;-a&quot;</span><span class="p">,</span> <span class="s2">&quot;-s&quot;</span><span class="p">,</span> <span class="n">disk_img</span><span class="p">])</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="n">kpartx_output</span><span class="p">)</span>

    <span class="c1"># list of (deviceName, sizeInBytes)</span>
    <span class="n">loop_devices</span> <span class="o">=</span> <span class="p">[]</span>
    <span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">kpartx_output</span><span class="o">.</span><span class="n">splitlines</span><span class="p">():</span>
        <span class="c1"># add map loop2p3 (253:4): 0 7139328 linear /dev/loop2 528384</span>
        <span class="c1"># 3rd element is size in 512 byte blocks</span>
        <span class="k">if</span> <span class="n">line</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">&quot;add map &quot;</span><span class="p">):</span>
            <span class="n">fields</span> <span class="o">=</span> <span class="n">line</span><span class="p">[</span><span class="mi">8</span><span class="p">:]</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
            <span class="n">loop_devices</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> <span class="p">(</span><span class="n">fields</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="nb">int</span><span class="p">(</span><span class="n">fields</span><span class="p">[</span><span class="mi">3</span><span class="p">])</span><span class="o">*</span><span class="mi">512</span><span class="p">)</span> <span class="p">)</span>
    <span class="k">return</span> <span class="n">loop_devices</span></div>

<div class="viewcode-block" id="PartitionMount"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.PartitionMount">[docs]</a><span class="k">class</span> <span class="nc">PartitionMount</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Mount a partitioned image file using kpartx &quot;&quot;&quot;</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">disk_img</span><span class="p">,</span> <span class="n">mount_ok</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">submount</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        :param str disk_img: The full path to a partitioned disk image</span>
<span class="sd">        :param mount_ok: A function that is passed the mount point and</span>
<span class="sd">                         returns True if it should be mounted.</span>
<span class="sd">        :param str submount: Directory inside mount_dir to mount at</span>

<span class="sd">        If mount_ok is not set it will look for /etc/passwd</span>

<span class="sd">        If the partition is found it will be mounted under a temporary</span>
<span class="sd">        directory and self.temp_dir set to it. If submount is passed it will be</span>
<span class="sd">        created and mounted there instead, with self.mount_dir set to point to</span>
<span class="sd">        it. self.mount_dev is set to the loop device, and self.mount_size is</span>
<span class="sd">        set to the size of the partition.</span>

<span class="sd">        When no subdir is passed self.temp_dir and self.mount_dir will be the same.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mount_dev</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mount_size</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">disk_img</span> <span class="o">=</span> <span class="n">disk_img</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mount_ok</span> <span class="o">=</span> <span class="n">mount_ok</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">submount</span> <span class="o">=</span> <span class="n">submount</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span> <span class="o">=</span> <span class="kc">None</span>

        <span class="c1"># Default is to mount partition with /etc/passwd</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">mount_ok</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">mount_ok</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">mount_dir</span><span class="p">:</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">mount_dir</span><span class="o">+</span><span class="s2">&quot;/etc/passwd&quot;</span><span class="p">)</span>

        <span class="c1"># list of (deviceName, sizeInBytes)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">loop_devices</span> <span class="o">=</span> <span class="n">kpartx_disk_img</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">disk_img</span><span class="p">)</span>

    <span class="k">def</span> <span class="fm">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="c1"># Mount the device selected by mount_ok, if possible</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">mkdtemp</span><span class="p">()</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">submount</span><span class="p">:</span>
            <span class="n">mount_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">normpath</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">submount</span><span class="p">]))</span>
            <span class="n">os</span><span class="o">.</span><span class="n">makedirs</span><span class="p">(</span><span class="n">mount_dir</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="mo">0o755</span><span class="p">,</span> <span class="n">exist_ok</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">mount_dir</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span>
        <span class="k">for</span> <span class="n">dev</span><span class="p">,</span> <span class="n">size</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">loop_devices</span><span class="p">:</span>
            <span class="k">try</span><span class="p">:</span>
                <span class="n">mount</span><span class="p">(</span> <span class="s2">&quot;/dev/mapper/&quot;</span><span class="o">+</span><span class="n">dev</span><span class="p">,</span> <span class="n">mnt</span><span class="o">=</span><span class="n">mount_dir</span> <span class="p">)</span>
                <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">mount_ok</span><span class="p">(</span><span class="n">mount_dir</span><span class="p">):</span>
                    <span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span> <span class="o">=</span> <span class="n">mount_dir</span>
                    <span class="bp">self</span><span class="o">.</span><span class="n">mount_dev</span> <span class="o">=</span> <span class="n">dev</span>
                    <span class="bp">self</span><span class="o">.</span><span class="n">mount_size</span> <span class="o">=</span> <span class="n">size</span>
                    <span class="k">break</span>
                <span class="n">umount</span><span class="p">(</span> <span class="n">mount_dir</span> <span class="p">)</span>
            <span class="k">except</span> <span class="n">CalledProcessError</span><span class="p">:</span>
                <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="n">traceback</span><span class="o">.</span><span class="n">format_exc</span><span class="p">())</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="p">:</span>
            <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Partition mounted on </span><span class="si">%s</span><span class="s2"> size=</span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">mount_size</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;Unable to mount anything from </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">disk_img</span><span class="p">)</span>
            <span class="n">os</span><span class="o">.</span><span class="n">rmdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span><span class="p">)</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="k">return</span> <span class="bp">self</span>

    <span class="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">tracebk</span><span class="p">):</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span><span class="p">:</span>
            <span class="n">umount</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="p">)</span>
            <span class="n">shutil</span><span class="o">.</span><span class="n">rmtree</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span><span class="p">)</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span> <span class="o">=</span> <span class="kc">None</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">temp_dir</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="n">execWithRedirect</span><span class="p">(</span><span class="s2">&quot;kpartx&quot;</span><span class="p">,</span> <span class="p">[</span><span class="s2">&quot;-d&quot;</span><span class="p">,</span> <span class="s2">&quot;-s&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">disk_img</span><span class="p">])</span></div>


<div class="viewcode-block" id="DracutChroot"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.DracutChroot">[docs]</a><span class="k">class</span> <span class="nc">DracutChroot</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Setup the chroot for running dracut inside it, cleanup when done</span>

<span class="sd">    This mount /proc, /dev, and /var/tmp plus optional bind mounted directories</span>
<span class="sd">    as a list of (source, destination) tuples where destination is relative to the chroot.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">root</span><span class="p">,</span> <span class="n">bind</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">root</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">bind</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">&quot;/var/tmp&quot;</span><span class="p">,</span> <span class="s2">&quot;/var/tmp&quot;</span><span class="p">)]</span> <span class="o">+</span> <span class="p">(</span><span class="n">bind</span> <span class="k">if</span> <span class="n">bind</span> <span class="k">else</span> <span class="p">[])</span>

    <span class="k">def</span> <span class="fm">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="p">[</span><span class="n">d</span> <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">d</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">bind</span><span class="p">]</span> <span class="o">+</span> <span class="p">[</span><span class="s2">&quot;/proc&quot;</span><span class="p">,</span> <span class="s2">&quot;/dev&quot;</span><span class="p">]:</span>
            <span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">+</span> <span class="n">d</span><span class="p">):</span>
                <span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">&quot;Making missing dracut chroot directory: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">d</span><span class="p">)</span>
                <span class="n">os</span><span class="o">.</span><span class="n">makedirs</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">+</span> <span class="n">d</span><span class="p">)</span>

        <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;mount&quot;</span><span class="p">,</span> <span class="s2">&quot;-t&quot;</span><span class="p">,</span> <span class="s2">&quot;proc&quot;</span><span class="p">,</span> <span class="s2">&quot;-o&quot;</span><span class="p">,</span> <span class="s2">&quot;nosuid,noexec,nodev&quot;</span><span class="p">,</span> <span class="s2">&quot;proc&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">+</span> <span class="s2">&quot;/proc&quot;</span> <span class="p">])</span>
        <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;mount&quot;</span><span class="p">,</span> <span class="s2">&quot;-t&quot;</span><span class="p">,</span> <span class="s2">&quot;devtmpfs&quot;</span><span class="p">,</span> <span class="s2">&quot;-o&quot;</span><span class="p">,</span> <span class="s2">&quot;mode=0755,noexec,nosuid,strictatime&quot;</span><span class="p">,</span> <span class="s2">&quot;devtmpfs&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">+</span> <span class="s2">&quot;/dev&quot;</span> <span class="p">])</span>

        <span class="k">for</span> <span class="n">s</span><span class="p">,</span> <span class="n">d</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">bind</span><span class="p">:</span>
            <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;mount&quot;</span><span class="p">,</span> <span class="s2">&quot;-o&quot;</span><span class="p">,</span> <span class="s2">&quot;bind&quot;</span><span class="p">,</span> <span class="n">s</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">+</span> <span class="n">d</span><span class="p">])</span>

        <span class="k">return</span> <span class="bp">self</span>

    <span class="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">tracebk</span><span class="p">):</span>
        <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;umount&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">+</span> <span class="s2">&quot;/proc&quot;</span> <span class="p">])</span>
        <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;umount&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">+</span> <span class="s2">&quot;/dev&quot;</span> <span class="p">])</span>

        <span class="c1"># cleanup bind mounts</span>
        <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">d</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">bind</span><span class="p">:</span>
            <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;umount&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">+</span> <span class="n">d</span> <span class="p">])</span>

<div class="viewcode-block" id="DracutChroot.Run"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.DracutChroot.Run">[docs]</a>    <span class="k">def</span> <span class="nf">Run</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">args</span><span class="p">):</span>
        <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;dracut&quot;</span><span class="p">]</span> <span class="o">+</span> <span class="n">args</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span></div></div>


<span class="c1">######## Functions for making filesystem images ##########################</span>

<div class="viewcode-block" id="mkfsimage"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkfsimage">[docs]</a><span class="k">def</span> <span class="nf">mkfsimage</span><span class="p">(</span><span class="n">fstype</span><span class="p">,</span> <span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">mkfsargs</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">graft</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Generic filesystem image creation function.</span>
<span class="sd">    fstype should be a filesystem type - &quot;mkfs.${fstype}&quot; must exist.</span>
<span class="sd">    graft should be a dict: {&quot;some/path/in/image&quot;: &quot;local/file/or/dir&quot;};</span>
<span class="sd">    if the path ends with a &#39;/&#39; it&#39;s assumed to be a directory.</span>
<span class="sd">    Will raise CalledProcessError if something goes wrong.&#39;&#39;&#39;</span>
    <span class="n">mkfsargs</span> <span class="o">=</span> <span class="n">mkfsargs</span> <span class="ow">or</span> <span class="p">[]</span>
    <span class="n">graft</span> <span class="o">=</span> <span class="n">graft</span> <span class="ow">or</span> <span class="p">{}</span>
    <span class="n">preserve</span> <span class="o">=</span> <span class="p">(</span><span class="n">fstype</span> <span class="ow">not</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">&quot;msdos&quot;</span><span class="p">,</span> <span class="s2">&quot;vfat&quot;</span><span class="p">))</span>
    <span class="k">if</span> <span class="ow">not</span> <span class="n">size</span><span class="p">:</span>
        <span class="n">size</span> <span class="o">=</span> <span class="n">estimate_size</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">graft</span><span class="p">,</span> <span class="n">fstype</span><span class="p">)</span>
    <span class="k">with</span> <span class="n">LoopDev</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">)</span> <span class="k">as</span> <span class="n">loopdev</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;mkfs.</span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="n">fstype</span><span class="p">]</span> <span class="o">+</span> <span class="n">mkfsargs</span> <span class="o">+</span> <span class="p">[</span><span class="n">loopdev</span><span class="p">])</span>
        <span class="k">except</span> <span class="n">CalledProcessError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
            <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;mkfs exited with a non-zero return code: </span><span class="si">%d</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">e</span><span class="o">.</span><span class="n">returncode</span><span class="p">)</span>
            <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">output</span><span class="p">)</span>
            <span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">returncode</span><span class="p">)</span>

        <span class="k">with</span> <span class="n">Mount</span><span class="p">(</span><span class="n">loopdev</span><span class="p">,</span> <span class="n">mountargs</span><span class="p">)</span> <span class="k">as</span> <span class="n">mnt</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">rootdir</span><span class="p">:</span>
                <span class="n">copytree</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">mnt</span><span class="p">,</span> <span class="n">preserve</span><span class="p">)</span>
            <span class="n">do_grafts</span><span class="p">(</span><span class="n">graft</span><span class="p">,</span> <span class="n">mnt</span><span class="p">,</span> <span class="n">preserve</span><span class="p">)</span>

            <span class="c1"># Save information about filesystem usage</span>
            <span class="n">execWithRedirect</span><span class="p">(</span><span class="s2">&quot;df&quot;</span><span class="p">,</span> <span class="p">[</span><span class="n">mnt</span><span class="p">])</span>

    <span class="c1"># Make absolutely sure that the data has been written</span>
    <span class="n">runcmd</span><span class="p">([</span><span class="s2">&quot;sync&quot;</span><span class="p">])</span></div>

<span class="c1"># convenience functions with useful defaults</span>
<div class="viewcode-block" id="mkdosimg"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkdosimg">[docs]</a><span class="k">def</span> <span class="nf">mkdosimg</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="s2">&quot;shortname=winnt,umask=0077&quot;</span><span class="p">,</span> <span class="n">graft</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="n">graft</span> <span class="o">=</span> <span class="n">graft</span> <span class="ow">or</span> <span class="p">{}</span>
    <span class="n">mkfsargs</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;-n&quot;</span><span class="p">,</span> <span class="n">label</span><span class="p">]</span>
    <span class="k">if</span> <span class="s1">&#39;SOURCE_DATE_EPOCH&#39;</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">:</span>
        <span class="n">mkfsargs</span><span class="o">.</span><span class="n">extend</span><span class="p">([</span><span class="s2">&quot;-i&quot;</span><span class="p">,</span>
                <span class="s2">&quot;</span><span class="si">{:x}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s1">&#39;SOURCE_DATE_EPOCH&#39;</span><span class="p">]))])</span>
    <span class="n">mkfsimage</span><span class="p">(</span><span class="s2">&quot;msdos&quot;</span><span class="p">,</span> <span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="n">mountargs</span><span class="p">,</span>
              <span class="n">mkfsargs</span><span class="o">=</span><span class="n">mkfsargs</span><span class="p">,</span> <span class="n">graft</span><span class="o">=</span><span class="n">graft</span><span class="p">)</span></div>

<div class="viewcode-block" id="mkext4img"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkext4img">[docs]</a><span class="k">def</span> <span class="nf">mkext4img</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">graft</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="n">graft</span> <span class="o">=</span> <span class="n">graft</span> <span class="ow">or</span> <span class="p">{}</span>
    <span class="n">mkfsimage</span><span class="p">(</span><span class="s2">&quot;ext4&quot;</span><span class="p">,</span> <span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="n">mountargs</span><span class="p">,</span>
              <span class="n">mkfsargs</span><span class="o">=</span><span class="p">[</span><span class="s2">&quot;-L&quot;</span><span class="p">,</span> <span class="n">label</span><span class="p">,</span> <span class="s2">&quot;-b&quot;</span><span class="p">,</span> <span class="s2">&quot;4096&quot;</span><span class="p">,</span> <span class="s2">&quot;-m&quot;</span><span class="p">,</span> <span class="s2">&quot;0&quot;</span><span class="p">],</span> <span class="n">graft</span><span class="o">=</span><span class="n">graft</span><span class="p">)</span></div>

<div class="viewcode-block" id="mkbtrfsimg"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkbtrfsimg">[docs]</a><span class="k">def</span> <span class="nf">mkbtrfsimg</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">graft</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="n">graft</span> <span class="o">=</span> <span class="n">graft</span> <span class="ow">or</span> <span class="p">{}</span>
    <span class="n">mkfsimage</span><span class="p">(</span><span class="s2">&quot;btrfs&quot;</span><span class="p">,</span> <span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="n">mountargs</span><span class="p">,</span>
               <span class="n">mkfsargs</span><span class="o">=</span><span class="p">[</span><span class="s2">&quot;-L&quot;</span><span class="p">,</span> <span class="n">label</span><span class="p">],</span> <span class="n">graft</span><span class="o">=</span><span class="n">graft</span><span class="p">)</span></div>

<div class="viewcode-block" id="mkhfsimg"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkhfsimg">[docs]</a><span class="k">def</span> <span class="nf">mkhfsimg</span><span class="p">(</span><span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="n">graft</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="n">graft</span> <span class="o">=</span> <span class="n">graft</span> <span class="ow">or</span> <span class="p">{}</span>
    <span class="n">mkfsimage</span><span class="p">(</span><span class="s2">&quot;hfsplus&quot;</span><span class="p">,</span> <span class="n">rootdir</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">size</span><span class="p">,</span> <span class="n">mountargs</span><span class="o">=</span><span class="n">mountargs</span><span class="p">,</span>
              <span class="n">mkfsargs</span><span class="o">=</span><span class="p">[</span><span class="s2">&quot;-v&quot;</span><span class="p">,</span> <span class="n">label</span><span class="p">],</span> <span class="n">graft</span><span class="o">=</span><span class="n">graft</span><span class="p">)</span></div>

<div class="viewcode-block" id="mkfsimage_from_disk"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.mkfsimage_from_disk">[docs]</a><span class="k">def</span> <span class="nf">mkfsimage_from_disk</span><span class="p">(</span><span class="n">diskimage</span><span class="p">,</span> <span class="n">fsimage</span><span class="p">,</span> <span class="n">img_size</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s2">&quot;Anaconda&quot;</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Copy the / partition of a partitioned disk image to an un-partitioned</span>
<span class="sd">    disk image.</span>

<span class="sd">    :param str diskimage: The full path to partitioned disk image with a /</span>
<span class="sd">    :param str fsimage: The full path of the output fs image file</span>
<span class="sd">    :param int img_size: Optional size of the fsimage in MiB or None to make</span>
<span class="sd">       it as small as possible</span>
<span class="sd">    :param str label: The label to apply to the image. Defaults to &quot;Anaconda&quot;</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">with</span> <span class="n">PartitionMount</span><span class="p">(</span><span class="n">diskimage</span><span class="p">)</span> <span class="k">as</span> <span class="n">img_mount</span><span class="p">:</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="n">img_mount</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">img_mount</span><span class="o">.</span><span class="n">mount_dir</span><span class="p">:</span>
            <span class="k">return</span> <span class="kc">None</span>

        <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Creating fsimage </span><span class="si">%s</span><span class="s2"> (</span><span class="si">%s</span><span class="s2">)&quot;</span><span class="p">,</span> <span class="n">fsimage</span><span class="p">,</span> <span class="n">img_size</span> <span class="ow">or</span> <span class="s2">&quot;minimized&quot;</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">img_size</span><span class="p">:</span>
            <span class="c1"># convert to Bytes</span>
            <span class="n">img_size</span> <span class="o">*=</span> <span class="mi">1024</span><span class="o">**</span><span class="mi">2</span>

        <span class="n">mkext4img</span><span class="p">(</span><span class="n">img_mount</span><span class="o">.</span><span class="n">mount_dir</span><span class="p">,</span> <span class="n">fsimage</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="n">img_size</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="n">label</span><span class="p">)</span></div>

<div class="viewcode-block" id="default_image_name"><a class="viewcode-back" href="../../pylorax.html#pylorax.imgutils.default_image_name">[docs]</a><span class="k">def</span> <span class="nf">default_image_name</span><span class="p">(</span><span class="n">compression</span><span class="p">,</span> <span class="n">basename</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Return a default image name with the correct suffix for the compression type.</span>

<span class="sd">    :param str compression: Compression type</span>
<span class="sd">    :param str basename: Base filename</span>
<span class="sd">    :returns: basename with compression suffix</span>

<span class="sd">    If the compression is unknown it defaults to xz</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">SUFFIXES</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;xz&quot;</span><span class="p">:</span> <span class="s2">&quot;.xz&quot;</span><span class="p">,</span> <span class="s2">&quot;gzip&quot;</span><span class="p">:</span> <span class="s2">&quot;.gz&quot;</span><span class="p">,</span> <span class="s2">&quot;bzip2&quot;</span><span class="p">:</span> <span class="s2">&quot;.bz2&quot;</span><span class="p">,</span> <span class="s2">&quot;lzma&quot;</span><span class="p">:</span> <span class="s2">&quot;.lzma&quot;</span><span class="p">}</span>
    <span class="k">return</span> <span class="n">basename</span> <span class="o">+</span> <span class="n">SUFFIXES</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">compression</span><span class="p">,</span> <span class="s2">&quot;.xz&quot;</span><span class="p">)</span></div>
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